Exactly. Email and nextcloud exist. With a government or a bank's budget, it's not that hard to set these things up locally (i.e., within your jurisdiction). Look at France and Matrix for example. If someone tries to subvert your security measures, that can be taken up as a criminal offence. At least you are not relying on legalese and other agreements to safeguard your interests.
In a democracy, our rights are protected by the legal system. So your argument that it is all about "setting up your own system" is specious.
Then you aren't aware about India. The Government of India aggressively even revised a law, to get 2+ billion dollars of tax from Vodafone, after Vodafone won the case for not paying it in the Supreme Court of India. [Source: https://thewire.in/business/vodafone-versus-india-bit-intern... ].
Second, while your fears on abuse is valid, but this is how international laws slowly come into being. Each country makes their own laws and when they conflict with each other, they sit, talk and evolve mutually beneficial laws. (Or they fight wars and the winner enforces their laws).
Note that while these laws may seem protectionist, it's goal is to provide even foreign players a legal framework to do business in India.
That's software-as-a-service in a nutshell for you. Even if you opt to setup your own server, and develop a custom solution, the US government has the right to ask you to install black boxes on your network and or data centers (read about Lavabit shutting down because of this), if you are on US soil (or operating from the US?).
> No amount of regulation is going to fix that.
I disagree.